Find the sum Sn of the first n terms of the geometric sequence. -8, -16, -32, -64, -128, . . . ; n = 9
A. -4108
B. -4051
C. -4088
D. -4086
Answer: C
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Evaluate. 
4
A. - 
B. 
C. - 
D. 
If an argument reads
If ?ABC is an equilateral triangle with perimeter 3s units then each edge of ?ABC is s units long. If each edge of an equilateral triangle is s units long then its height is ?3s/2 units. If the height of an equilateral triangle is ?3s/2 units, then its area is ?3s2/4 units2. Then we can deduce (a) If ?ABC is an equilateral triangle with perimeter 3s units then its area is ?3s2/4 units2. (b) If the area of ?A|BC is| ?3s2/4 units2 then it is an equilateral triangle (c) If each edge of an equilateral triangle is s units long then its area is ?3s2/4 units2. (d) All of these are valid conclusions. (e) Both (a) and (c) are correct.
Translate the English sentence into a mathematical sentence and solve, if necessary. Use x as the variable.The height of a member of the basketball team is at least 81 inches.
A. x > 81 B. x < 81 C. x ? 81 D. x ? 81
Find the indicated intercept(s) of the graph of the function.y-intercept of f(x) = 
A. 
B. 
C. (0, 4)
D. none